Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D169/00—Coating compositions based on polycarbonates; Coating compositions based on derivatives of polycarbonates
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
  • C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
  • C09D167/03—Polyesters derived from dicarboxylic acids and dihydroxy compounds the dicarboxylic acids and dihydroxy compounds having the carboxyl - and the hydroxy groups directly linked to aromatic rings

Definitions

• the present invention relates to a coating agent composition, and more particularly to a coating agent composition containing a polymer having alkoxysilyl groups and a principal chain comprising a polycarbonate or a polyarylate.
• the present invention is also directed to a method of preparing the coating agent composition and to a coating material prepared therefrom.
• organopolysiloxane compositions which form cured coating films at room temperature.
• a composition consisting of a hydroxy group-containing organopolysiloxane resin, organoalkoxysilanes and an organic solvent has been proposed in Japanese Patent Application Kokai No. 51-148749.
• cured coating films produced from a composition consisting chiefly of this type of organopolysiloxane resin are inferior in terms of wear resistance, and are unsuitable for some applications.
• polycarbonates and polyarylates are known as coating agents, and are widely used in optical applications, etc.
• a medical material containing a polycarbonate with cross-linkable silyl groups as an active ingredient has been proposed (see Japanese Patent Application Kokai No. 58-109062).
• cured coating films produced from compositions containing a polycarbonate with cross-linkable silyl groups have inferior water-repellent properties, and, therefore, cannot be used in some applications.
• the present invention is directed to a coating agent composition
• a coating agent composition comprising:
• R is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms
• R′ is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms
• a is from 1 to 3;
• organosilane 1 to 90 parts by weight of an organosilane, wherein the organosilane is a compound having the formula R′′ e SiY 4 ⁇ e or a partially hydrolyzed condensate thereof, wherein R′′ is a substituted or unsubstituted monovalent hydrocarbon group or a hydrogen atom, Y is a hydrolyzable group, and e is from 0 to 2; and
• the present invention is also directed to a method of preparing a coating agent composition, comprising mixing Components (A) to (D) above.
• the present invention is further directed to a coating material prepared by curing the aforementioned coating agent composition.
• Component (A) of the present invention is a polymer having at least two alkoxysilyl groups.
• the alkoxysilyl groups may be located at pendant and/or terminal positions in the polymer.
• the polymer also has a number average molecular weight of 500 to 500,000 and has a principal chain comprising a polycarbonate or a polyarylate.
• the alkoxysilyl groups in component (A) have the formula:
• R is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms
• R′ is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms
• a is from 1 to 3.
• alkoxysilyl groups are ordinarily bonded to carbon atoms in component (A).
• the alkoxysilyl groups may be bonded to silicon atoms in component (A) through siloxane bonds.
• the alkoxysilyl groups may be bonded to the principal chains in the polymer via siloxane bonds.
• the principal chain of component (A) can comprise a polycarbonate.
• the constituent units of the polycarbonates include constituent units having the formula:
• R 2 is selected from the group consisting of hydrogen atoms, halogen atoms, monovalent hydrocarbon groups having 1 to 4 carbon atoms, and monovalent hydrocarbon groups having 1 to 4 carbon atoms and containing at least one alkoxysilyl group
• D is selected from the group consisting of divalent hydrocarbon groups having 1 to 20 carbon atoms, —O—, —S—, —CO—, —SO 2 —, and divalent hydrocarbon groups having 1 to 20 carbon atoms and containing at least one alkoxysilyl group.
• Examples of monovalent hydrocarbon groups represented by R 2 include, but are not limited to, alkyl groups, such as methyl, ethyl, propyl, and butyl; and alkenyl groups, such as vinyl and allyl.
• alkyl groups such as methyl, ethyl, propyl, and butyl
• alkenyl groups such as vinyl and allyl.
• at least 50% of the groups denoted by R 2 are hydrogen atoms.
• divalent hydrocarbon groups represented by D include alkylidene, aryl-substituted alkylidene, alkylene, cycloalkylene, arylene, and groups formed by bonding between any of the preceding groups.
• the structure of the alkylidene groups may be linear, branched or cyclic.
• Polycarbonates having the aforementioned structure can be prepared by reacting phosgene, a carbonic acid diester or a polycarbonate oligomer with a dihydric phenol compound having the formula:
• R 2 and D are as defined above.
• dihydric phenol compounds include bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)ether, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl) sulfoxide, bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)ketone, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxyphenyl)hexafluoropropane, 2,2-bis(4-hydroxyphenyl)butane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 2,2-bis(4-hydroxy-3,5-dibromophenyl)propane, 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane, 2,2-bis(4-hydroxy-3-bromophenyl)propane, 2,2-bis(4-hydroxy-3-chlorophenyl
• the principal chains of component (A) can comprise a polyarylate.
• the constituent units of the polyarylate include consituent units having the formula:
• R 2 and D are as defined above, and E is a substituted or unsubstituted divalent hydrocarbon group having 1 to 20 carbon atoms or a divalent hydrocarbon group having 1 to 20 carbon atoms and containing at least one alkoxysily group, provided at least 50 mole % of the groups denoted by E are aromatic hydrocarbon groups.
• aromatic hydrocarbon groups represented by E include ortho-phenylene, meta-phenylene, para-phenylene, naphthylene, and diphenylenealkane.
• divalent hydrocarbon groups other than aromatic groups include alkylene groups, cycloalkylene groups and halogen-substituted alkylene or cycloalkylene groups.
• Polyarylate having the aforementioned structure can be prepared, for example, by reacting the aforementioned dihydric phenol compounds with aromatic dicarboxylic acids. Reaction methods which can be used include ordinary melt polymerization methods, interfacial polymerization methods, solution polymerization methods, and other common polymerization methods.
• Component (A) of the present invention can be prepared by reacting an alkoxysilane containing silicon-bonded hydrogen atoms, having the formula:
• R and R′ are as defined above and a is from 1 to 3, with a polycarbonate or a polyarylate having unsaturated groups selected from the group consisting of alkenyl, alkenyloxy, alkynyl, and alkynyloxy.
• the unsaturated groups can be located at pendant and/or terminal positions in the polycarbonate or polyarylate.
• alkenyl groups include vinyl, allyl, and 5-hexenyl.
• alkynyl groups include ethynyl.
• alkenyloxy groups include vinyloxy, allyloxy, 5-hexenyloxy.
• alkynyloxy groups include ethynyloxy.
• alkenyl group-containing polymers suitable for use as component (A) in the present composition include polymers prepared by polymerizing 2,2-bis(2-allyl-4-hydroxyphenyl)propane or 2,2-bis(3-allyl-4-hydroxyphenyl)propane.
• Component (B) of the present invention is an organic solvent, which is used to disperse or dissolve component (A).
• Component (B) can be any organic solvent which volatilizes during coating.
• organic solvents include chlorinated hydrocarbons such as dichloromethane, 1,2-dichloroethane, 1,1,2,2-tetrachloroethane, chloroform, 1,1,1-trichloroethane, carbon tetrachloride, monochlorobenzene and dichlorobenzene; aromatic hydrocarbons such as benzene, toluene, xylene and ethylbenzene; ether compounds such as diethyl ether and tetrahydrofuran; ketone solvents such as methyl isobutyl ketone; fluorinated solvents such as ⁇ , ⁇ , ⁇ -trifluorotoluene and hexafluoroxylene; and volatile silicones such as hexamethyldisiloxan
• the amount of component (B) in the composition of the present invention is typically from 50 to 2,000 parts by weight and preferably from 100 to 1,000 parts by weight, per 100 parts by weight of component (A). If the amount of component (B) is less than 50 parts by weight, the viscosity of the composition becomes excessively high and handling becomes difficult. On the other hand, if the amount of component (B) exceeds 2,000 parts by weight, it becomes difficult to form a coating film.
• Component (C) of the present invention is an organosilane having the formula:
• Component (C) which functions as a cross-linking agent in the presence of moisture, can be a single organosilane, a partially hydrolyzed condensate thereof, or a mixture of two or more such compounds.
• Examples of unsubstituted monovalent hydrocarbon groups represented by R′′ include alkyl such as methyl, ethyl, propyl, tert-butyl, 2-ethylhexyl, dodecyl, and octadecyl; alkenyl such as vinyl and allyl; and aryl such as phenyl and naphthyl.
• alkyl groups and alkenyl groups are preferred, and methyl groups are particularly preferred.
• substituted monovalent hydrocarbon groups represented by R′′ include halogenated alkyl groups such as chloromethyl, 3,3,3-trifluoropropyl, and 3,3,4,4,5,5,5-heptafluoropentyl; amino functional groups such as 3-aminopropyl, ⁇ -(2-amnoethyl)aminopropyl, and 3-anilinopropyl groups; epoxy functional groups such as 3-glycidoxypropyl; and 3-methacryloxypropyl.
• halogenated alkyl groups such as chloromethyl, 3,3,3-trifluoropropyl, and 3,3,4,4,5,5,5-heptafluoropentyl
• amino functional groups such as 3-aminopropyl, ⁇ -(2-amnoethyl)aminopropyl, and 3-anilinopropyl groups
• epoxy functional groups such as 3-glycidoxypropyl
• 3-methacryloxypropyl 3-methacryloxypropyl.
• hydrolyzable groups represented by Y include alkoxy such as methoxy and ethoxy; diorganoketooxime such as dimethylketooxime and methylethylketooxime; acyloxy such as acetoxy; organoamino such as N-butylamino; organoacylamide such as methylacetamide; N,N-diorganohydroxyamino such as N,N-diethylhydroxyamino; and alkenyloxy such as propenoxy.
• alkoxy such as methoxy and ethoxy
• diorganoketooxime such as dimethylketooxime and methylethylketooxime
• acyloxy such as acetoxy
• organoamino such as N-butylamino
• organoacylamide such as methylacetamide
• N,N-diorganohydroxyamino such as N,N-diethylhydroxyamino
• alkenyloxy such as propenoxy
• the amount of Component (C) in the composition of the present invention is typically from 1 to 90 parts by weight and preferably from 1 to 60 parts by weight, per 100 parts by weight of component (A).
• Component (C) of the present invention include the following alkylalkoxysilane and silane coupling agents: CH 3 Si(OCH 3 ) 3 , C 6 H 5 Si(OCH 3 ) 3 , NH 2 CH 2 CH 2 Si(OC 2 H 5 ) 3 , NH 2 CH 2 CH 2 NH(CH 2 ) 3 Si(OCH 3 ) 3 , CH 2 ⁇ CHSi(OCH 3 ) 3 , CH 2 ⁇ CHSi(OC 2 H 5 ) 3 , CH 2 ⁇ CHSi(OOCCH 3 ) 3 , HS(CH2) 3 Si(OCH 3 ) 3 , CH 2 ⁇ C(CH 3 )Si(OCH 3 ) 3 ,
• Component (D) of the present invention is a cure catalyst that accelerates curing of the composition.
• Condensation reaction accelerating catalysts which are commonly used in the dehydration-condensation of silanol groups may be effectively used as the cure catalyst.
• catalysts include tin salts of carboxylic acids such as dibutyltin diacetate, dibutyltin dilaurate, dibutyltin dioctoate, stannous octoate, stannous naphthenate, stannous oleate, stannous isobutyrate, stannous linolate, stannous stearate, stannous benzolate, stannous naphthoate, stannous laurate, stannous o-thymate, stannous ⁇ -benzoylpropionate, stannous crotonate, stannous tropate, stannous p-bromobenzoate, stannous palmitooleate, stannous
• the amount of component (D) in the present composition is sufficient to cure the composition.
• the amount of component (D) is from 0.0001 to 10 parts by weight per 100 parts by weight of component (A).
• composition of the present invention can be prepared by uniformly mixing the abovementioned components (A) through (D) in the absence of moisture. There are no particular restrictions on the order of mixing. However, because the polymer of Component (A) is typically a solid, the present coating agent composition is preferably prepared by dispersing or dissolving Component (A) in component (B), and then combining the resulting mixture with the other components.
• composition of the present invention described above can be stored for a long period of time in the absence of moisture. In the presence of moisture, either at room temperature or under heating, the composition cures to form a coating film which is superior in terms of water-repellent characteristics, wear resistance and resistance to organic solvents. Accordingly, the composition of the present invention is useful in applications requiring such properties, such as optical materials, sliding parts in electrical or electronic parts, anti-soiling coating agents, and coating agents used for stripping or mold release.
• 0.8 g of methyltrimethoxysilane and 0.16 g of dibutyltin dilaurate were added to a mixture consisting of 4 g of the polycarbonate obtained in Reference Example 1 and 16 g of chlorobenzene. These ingredients were then mixed to produce a coating agent composition.
• the curable polymer composition was applied to the surface of a flat, smooth glass plate using a spin coater and was then heated for 1 hour at 120° C. to give a transparent cured coating film.
• the contact angle of water on the cured coating was 98 degrees.
• the pencil hardness of the cured coating determined using the method stipulated in JIS K5400, was 3H.
• a drop of toluene was applied to the surface of the cured coating film and then immediately wiped away with paper, no mark remained.
• the coating agent composition was applied to the surface of a flat, smooth glass plate using a spin coater and was then allowed to stand for one week at room temperature to give a transparent cured coating film.
• the contact angle of water on the cured coating film was 97 degrees.
• the pencil hardness of the cured coating was, determined using the method stipulated in JIS K5400, was 3H.
• dibutyltin dilaurate 0.16 g was added to a mixture consisting of 4 g of the polycarbonate obtained in Reference Example 1 and 16 g of chlorobenzene. These ingredients were then mixed to produce a coating agent composition.
• the coating agent composition was applied to the surface of a flat, smooth glass plate using a spin coater and was then allowed to stand for one week at room temperature to give a transparent cured coating film.
• the contact angle of water on the cured coating film was 97 degrees.
• the pencil hardness of the cured coating determined using the method stipulated in JIS K5400, was 1H. Moreover, when a drop of toluene was applied to the surface of the cured coating and then immediately wiped away with paper, a white mark remained.
• a coating agent composition was prepared as in Example 1, except that a mixture consisting of 16 g of toluene and 4 g of a methylpolysiloxane resin, consisting of 80 mol % siloxane units expressed by the formula (CH 3 )SiO 3/2 and 20 mol % siloxane units expressed by the formula (CH 3 ) 2 SiO 2/2 , was used instead of the chlorobenzene solution of the polycarbonate obtained in Reference Example 1.
• the silicone composition was applied to the surface of a flat, smooth glass plate using a spin coater and was then allowed to stand for one week at room temperature to give a transparent cured coating film.
• the contact angle of water on the cured coating film was 97 degrees.
• the pencil hardness of the cured coating determined using the method stipulated in JIS K5400, was 1H. Moreover, when the cured coating film was rubbed with No. 300 sandpaper, scratching and whitening were seen.

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Cited By (8)

Citations (2)

• 1998
  • 1998-04-28 JP JP10134515A patent/JPH11310756A/ja active Pending
• 1999
  • 1999-04-28 US US09/301,258 patent/US6174966B1/en not_active Expired - Fee Related

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